Office chair



FIG. 1 is a front perspective view of an office chair, showing our new design;

FIG. 2 is a right-side elevation view of FIG. 1, the left-side elevation view being a mirror image thereof;

FIG. 3 is a front elevation view of FIG. 1;

FIG. 4 is a rear elevation view of FIG. 1;

FIG. 5 is a top plan view of FIG. 1;

FIG. 6 is a bottom plan view of FIG. 1; and,

FIG. 7 is a rear perspective view of FIG. 1.

The broken lines shown in the drawings depict portions of the office chair that form no part of the claimed design. 

CLAIM The ornamental design for an office chair, as shown and described. 